A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

O'Reilly, Ailes face sex harassment claims

A Fox News contributor has come forward to level more sexual-harassment allegations against deposed chief executive Roger Ailes, two days after it was revealed the network's most popular on-air personality, Bill O'Reilly, has settled multiple complaints about his own behaviour with women.

O'Reilly returned to the air on Monday following a weekend report in The New York Times that he and his employer had paid five women $US13 million ($A17 million) to settle allegations of sexual harassment or other inappropriate conduct by Fox's ratings king. He made no mention of the case on his show.

Meanwhile, the lawyer for another woman who says she was punished for rebuffing O'Reilly's advances called on New York City's Human Rights Commission to investigate O'Reilly's behaviour.

The new lawsuit against Ailes was brought by Fox's Julie Roginsky and is notable because it accuses Fox's current management of trying to cover up for Ailes.

Roginsky said Ailes, who lost his job last summer following sexual-harassment complaints he has denied, suggested she have sex with "older, married, conservative men". She said Ailes would insist upon a kiss hello at their meetings, requiring her to bend over so he could look down her dress.

She was seeking a permanent role on Fox's show The Five. But after an April 2015 meeting at which she turned down Ailes' advances, he wouldn't meet with her again, and she never got the regular role, she said.

At a Los Angeles news conference on Monday, lawyer Lisa Bloom detailed allegations against O'Reilly by Wendy Walsh, a regular guest on the prime-time show The O'Reilly Factor.

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Bloom said O'Reilly had told Walsh he would recommend her for a paid contributor role on the network. Walsh and O'Reilly had dinner in LA in 2013, but when Walsh refused his invitation to go to his hotel room, his attitude changed and she was soon dropped from the show, according to Walsh.

Bloom was seeking an investigation by the city Human Rights Commission.

Walsh said she came forward because she was told by a Times reporter that many of the women who have accused O'Reilly of harassment are bound by gag orders. She said she is not bound by any such agreement, and the statute of limitations for suing has run out.

"Nobody can silence me because my voice is not for sale," Walsh said. "Nobody can buy my voice."

O'Reilly said over the weekend he is vulnerable to lawsuits from people who threaten to cause him bad publicity unless they get paid. He said he had "put to rest any controversies" to spare his children.

O'Reilly's ratings have gone up over the past year with the intense interest in politics. Independent studies show he generates more than $US100 million ($A131 million) in advertising revenue per year for TV's top-rated cable news network. But at least one advertiser, car company Mercedes-Benz, said it was pulling its ads from the show because of the "disturbing" allegations.